Add Postgres reporter generator and integration tests

Denis Morozovrequested to merge
checkup-reports-tests into main
  • Add pytest+coverage harness (fixtures, --run-integration flag, sink-backed integration for get_index_definitions_from_sink) so reporter tests can run in CI.
  • Add first unit suite for PostgresReportGenerator: covers A002/A003/A004/A007, H001/H002/H004, D004/F001/F005, K001/K003, pg_stat helpers, _get_pgss_metrics_data_by_db, and CLI flows (generate_all_reports, create_report, upload_report_file).
Edited by Denis Morozov

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